A dozen Secret Service agents sent to Colombia to provide security for President Barack Obama at an international summit have been relieved of duty over alleged misconduct.

A caller who said he had knowledge of the situation told The Associated Press the misconduct involved prostitutes in Cartagena, site of the Summit of the Americas. A Secret Service spokesman did not dispute that.

A U.S. official, who was not authorized to speak publicly on the matter and requested anonymity, put the number of agents sent home at 12. Secret Service was not releasing the number of personnel involved. . .